package com.atguigu.educenter.controller;

import com.atguigu.commonutils.JwtUtils;
import com.atguigu.educenter.entity.UcenterMember;
import com.atguigu.educenter.service.UcenterMemberService;
import com.atguigu.educenter.utils.ConstantWxUtils;
import com.atguigu.educenter.utils.HttpClientUtils;
import com.atguigu.servicebase.exceptionhandle.GuliException;
import com.google.gson.Gson;
import feign.FeignException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.net.URLEncoder;
import java.util.HashMap;

@CrossOrigin
@Controller //知识请求地址，不需要返回数据
@RequestMapping("/api/ucenter/wx")
public class WxApiController {

    @Autowired
    private UcenterMemberService memberService;
    //获取扫描人信息
    @GetMapping("callback")
    public String callback(String code,String state){
        try{
            //获取code值，临时票据，类似验证码
            //用code请求微信固定地址，得到两个值accsess_token和openid
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";

            //拼接三个参数：id 密钥 和 code值
            String accessTokenUrl = String.format(
                    baseAccessTokenUrl,
                    ConstantWxUtils.WX_OPEN_APP_ID,
                    ConstantWxUtils.WX_OPEN_APP_SECRET,
                    code
            );

            //请求拼接地址，得到返回两个值access_token和openid
            //使用httpclient发送请求，得到返回结果
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);

            //从accessTokenInfo字符串获取出来两个值access_token和openid
            //把accessTokenInfo字符串转换map集合，根据map里面key获取对应值
            //使用json转换工具Gson
            Gson gson = new Gson();
            HashMap mapAccessToken = gson.fromJson(accessTokenInfo,HashMap.class);
            String access_token = (String) mapAccessToken.get("access_token");
            String openid = (String) mapAccessToken.get("openid");



            //把扫描人信息添加数据库里面
            //判断数据表里面是否存在相同的微信信息
            UcenterMember member = memberService.getOpenIdMember(openid);
            if(member == null){ //member是空，表没有相同微信数据，进行添加

                //拿着得到access_token和openid,再去请求微信提供固定的地址，获取到扫描人信息
                //访问微信的资源服务器，获取用户信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";

                String userInfoUrl = String.format(
                        baseUserInfoUrl,
                        access_token,
                        openid
                );
                //发送请求
                String userInfo = HttpClientUtils.get(userInfoUrl);
                //获取返回userInfo字符串扫描人信息
                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
                String nickname = (String) userInfoMap.get("nickname");
                String headimgurl = (String) userInfoMap.get("headimgurl");

                member = new UcenterMember();
                member.setOpenid(openid);
                member.setNickname(nickname);
                member.setAvatar(headimgurl);
                memberService.save(member);

            }

            //使用jwt根据member对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());
            //最后：返回首页面，通过路径传递token字符串

            return "redirect:http://localhost:3000?token="+jwtToken;
        }catch (Exception e){
            throw new GuliException(20001,"登录失败");

        }


    }

    //生成微信扫描二维码
    @GetMapping("login")
    public String getWxCode(){
        //请求微信地址
        //微信开放平台授权baseUrl %s相当于？代表占位符
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
        "?appid=%s" +
        "&redirect_uri=%s" +
        "&response_type=code" +
        "&scope=snsapi_login" +
        "&state=%s" +
        "#wechat_redirect";

        //对redirect_url进行URLEncoder编码
       String redirectUrl = ConstantWxUtils.WX_OPEN_REDIRECT_URL;
       try{
           redirectUrl = URLEncoder.encode(redirectUrl,"utf-8");
       }catch (Exception e){

       }


        String url = String.format(
                baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                redirectUrl,
                "atguigu"
        );
        //重定向到请求微信地址里面
        return "redirect:"+url;
    }
}
